UITextView disabling text selection

问题

I'm having a hard time getting the UITextView to disable the selecting of the text.

I've tried:

canCancelContentTouches = YES;

I've tried subclassing and overwriting:

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender

(But that gets called only After the selection)

- (BOOL)touchesShouldCancelInContentView:(UIView *)view;

(I don't see that getting fired at all)

- (BOOL)touchesShouldBegin:(NSSet *)touches
                 withEvent:(UIEvent *)event
             inContentView:(UIView *)view;

(I don't see that getting fired either)

What am I missing?

回答1:

Issue How disable Copy, Cut, Select, Select All in UITextView has a workable solution to this that I've just implemented and verified:

Subclass UITextView and overwrite canBecomeFirstResponder:

- (BOOL)canBecomeFirstResponder {
    return NO;
}

Note that this disables links and other tappable text content.

回答2:

I've found that calling

[textView setUserInteractionEnabled:NO];

works quite well.

回答3:

UITextView's selectable property:

This property controls the ability of the user to select content and interact with URLs and text attachments. The default value is YES.

回答4:

It sounds like what you actually want is a giant UILabel inside a UIScrollView, and not a UITextView.

update: if you are on newer versions of iOS UILabel now has a lines property:

Multiple lines of text in UILabel

回答5:

If you just want to prevent it from being edited, then set the UITextView's "editable" property to NO/False.

If you're trying to leave it editable but not selectable, that's going to be tricky. You might need to create a hidden textview that the user can type into and then have UITextView observe that hidden textview and populate itself with the textview's text.

回答6:

To do this first subclass the UITextView

and in the implementation do the following

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event
{
    self.selectable = NO;
}

- (void)touchesCancelled:(nullable NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event
{
        self.selectable = YES;
 }

this should work fine,

回答7:

Swift 4, Xcode 10

This solution will

disable highlighting
enable tapping links
allow scrolling

Make sure you set the delegate to YourViewController

yourTextView.delegate = yourViewControllerInstance

Then

extension YourViewController: UITextViewDelegate {

    func textViewDidChangeSelection(_ textView: UITextView) {
        view.endEditing(true)
    }

}

回答8:

Swift 4, Xcode 10:

If you want to make it so the user isn't able to select or edit the text.

This makes it so it can not be edited:

textView.isEditable = false

This disables all user interaction:

textView.isUserInteractionEnabled = false

This makes it so that you can't select it. Meaning it will not show the edit or paste options. I think this is what you are looking for.

textView.isSelectable = false

回答9:

Did you try setting userInteractionEnabled to NO for your UITextView? But you'd lose scrolling too.

If you need scrolling, which is probably why you used a UITextView and not a UILabel, then you need to do more work. You'll probably have to override canPerformAction:withSender: to return NO for actions that you don't want to allow:

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
    switch (action) {
        case @selector(paste:):
        case @selector(copy:):
        case @selector(cut:):
        case @selector(cut:):
        case @selector(select:):
        case @selector(selectAll:):
        return NO;
    }
    return [super canPerformAction:action withSender:sender];
}

For more, UIResponderStandardEditActions .

回答10:

You can disable text selection by subclassing UITextView.

The below solution is:

compatible with isScrollEnabled
compatible with loupe/magnifier
but not compatible with links (see here for a solution compatible with links)

/// Class to disallow text selection
/// while keeping support for loupe/magnifier and scrolling
/// https://stackoverflow.com/a/49428248/1033581
class UnselectableTextView: UITextView {

    override init(frame: CGRect, textContainer: NSTextContainer?) {
        super.init(frame: frame, textContainer: textContainer)
        commonInit()
    }
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        commonInit()
    }
    private func commonInit() {
        // prevents selection from loupe/magnifier (_UITextSelectionForceGesture), multi tap, tap and a half, etc.
        // without losing the loupe/magnifier or scrolling
        // but we lose taps on links
        addSubview(transparentOverlayView)
    }
    let transparentOverlayView: UIView = {
        $0.backgroundColor = .clear
        $0.autoresizingMask = [.flexibleHeight, .flexibleWidth]
        return $0
    }(UIView())
    override var contentSize: CGSize {
        didSet {
            transparentOverlayView.frame = CGRect(origin: .zero, size: contentSize)
        }
    }

    // required to prevent blue background selection from any situation
    override var selectedTextRange: UITextRange? {
        get { return nil }
        set {}
    }
}